What does it mean if someone is eagle-eyed?

The Wedge-Tailed Eagle (Aquila audax) from Australia, for example, can see objects further away than a human can. 

Scientists think that the Wedge-Tailed Eagle has a visual perception three times more acute than the visual perception of the human’s naked eye.

If someone is eagle-eyed, it means that they have great vision. 

Photographer: Martina Nicolls

Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM